Optical sensors that can be installed under an acoustic grand or upright piano. Comes with the TSUB unit and all the wiring. For more details visit QRS web site at: http://www.qrsmusic.com/PNOScan.asp
Price: $875US
Very nice! I am quite happy with mine, installed into an upright Steinway plus an additional stop bar that I also got from QRS. It allows you to have a piano that is acoustic, electronic, or both (similar to the Yamaha trans-acoustic series). Also, even with using the piano as an acoustic piano, it lets you record music via programs that score, or play music back with automatic page turning, etc. using programs that follow where you are.
Just seen your interesting post. Is it possible to send the QRS-PianoScan to Austria? Please contact me per email.
Looking forward, phepys